A source close to the cast, which is currently filming season four, tells this week’s issue of In Touch, “While the cameras were rolling, Brandi brought up to Kyle the rumors that her husband, Mauricio [Umansky], has been cheating on her. Kyle had no idea it was coming and was so uncomfortable.”

But once the cameras stopped rolling, the claws really came out. “Kyle threw a fit,” adds the source. “She even threatened to quit the show!”

Though Kyle was clearly hurt by the attack, the source tells In Touch that Brandi has no remorse. “Brandi is known for her low blows, and this season is no exception.”

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